US7424273B2 - Evaluating performance of a multiple-input multiple output (MIMO) communications link - Google Patents

Evaluating performance of a multiple-input multiple output (MIMO) communications link Download PDF

Info

Publication number
US7424273B2
US7424273B2 US10/715,923 US71592303A US7424273B2 US 7424273 B2 US7424273 B2 US 7424273B2 US 71592303 A US71592303 A US 71592303A US 7424273 B2 US7424273 B2 US 7424273B2
Authority
US
United States
Prior art keywords
channel capacity
level
fer
mimo
mobile user
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US10/715,923
Other languages
English (en)
Other versions
US20050118958A1 (en
Inventor
Angeliki Alexiou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia of America Corp
Meta Platforms Inc
Original Assignee
Lucent Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucent Technologies Inc filed Critical Lucent Technologies Inc
Priority to US10/715,923 priority Critical patent/US7424273B2/en
Assigned to LUCENT TECHNOLOGIES INC. reassignment LUCENT TECHNOLOGIES INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALEXIOU, ANGELIKI
Priority to EP04256702A priority patent/EP1533935B1/de
Priority to DE602004000557T priority patent/DE602004000557T2/de
Priority to KR1020040092296A priority patent/KR101080624B1/ko
Priority to JP2004333917A priority patent/JP4564339B2/ja
Publication of US20050118958A1 publication Critical patent/US20050118958A1/en
Application granted granted Critical
Publication of US7424273B2 publication Critical patent/US7424273B2/en
Assigned to CREDIT SUISSE AG reassignment CREDIT SUISSE AG SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALCATEL-LUCENT USA INC.
Assigned to ALCATEL-LUCENT USA INC. reassignment ALCATEL-LUCENT USA INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CREDIT SUISSE AG
Assigned to NOKIA USA INC. reassignment NOKIA USA INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PROVENANCE ASSET GROUP HOLDINGS, LLC, PROVENANCE ASSET GROUP LLC
Assigned to CORTLAND CAPITAL MARKET SERVICES, LLC reassignment CORTLAND CAPITAL MARKET SERVICES, LLC SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PROVENANCE ASSET GROUP HOLDINGS, LLC, PROVENANCE ASSET GROUP, LLC
Assigned to PROVENANCE ASSET GROUP LLC reassignment PROVENANCE ASSET GROUP LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALCATEL LUCENT SAS, NOKIA SOLUTIONS AND NETWORKS BV, NOKIA TECHNOLOGIES OY
Assigned to PROVENANCE ASSET GROUP, LLC reassignment PROVENANCE ASSET GROUP, LLC PARTIAL RELEASE OF SECURITY INTEREST RECORDED AT REEL/FRAME 043967/0001 Assignors: CORTLAND CAPITAL MARKET SERVICES LLC
Assigned to FACEBOOK, INC. reassignment FACEBOOK, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PROVENANCE ASSET GROUP LLC
Assigned to PROVENANCE ASSET GROUP, LLC reassignment PROVENANCE ASSET GROUP, LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: NOKIA USA INC.
Assigned to PROVENANCE ASSET GROUP HOLDINGS LLC reassignment PROVENANCE ASSET GROUP HOLDINGS LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: NOKIA USA INC.
Assigned to META PLATFORMS, INC. reassignment META PLATFORMS, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: FACEBOOK, INC.
Active legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/203—Details of error rate determination, e.g. BER, FER or WER
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/06—Testing, supervising or monitoring using simulated traffic

Definitions

  • the present invention relates wireless communications, and more particularly, to a method of evaluating the frame error probability of a communications link in a wireless telecommunications network.
  • an improvement in performance of a communication link between a base station and a mobile user terminal does not necessarily result in a corresponding improvement in performance of the overall network. Accordingly, to evaluate the overall improvement caused by, for example, introducing Multiple Input Multiple Output (MIMO) signalling between mobile user terminals and base stations, the improvement in performance of a large sample of links connecting base stations and mobile user terminals needs to be evaluated.
  • MIMO Multiple Input Multiple Output
  • frame error probability is the probability that a received frame includes at least one error; that is at least one received bit is not as sent. Calibration curves of FER versus SINR are produced and used to evaluate link-level performance. This is adequate for circuit-switched voice-centric radio networks where many channel states are encountered over a unit time, such as the duration of a coding-block.
  • system-level parameters for a mobile user terminal in a packet radio system are related to performance at communication link level by a variable C which is used to estimate the performance of the receiver in terms of frame error probability from pre-computed calibration data.
  • MIMO multiple input multiple output
  • a MIMO system 12 is shown in FIG. 2 consisting of a MIMO transmitter 14 having N transmit antennas 16 and a MIMO receiver 18 having M receive antennas 20 .
  • the transmitter 14 is one of a base station and a mobile user terminal.
  • the corresponding MIMO receiver 18 is the other of the base station and the mobile user terminal.
  • a data block to be transmitted is encoded and modulated to provide symbols of a complex constellation. Each symbol is then mapped to the transmit antennas 16 (a process known as spatial multiplexing) after some spatial weighting of the signal components to the various transmit antennas, known in the art as space-time coding.
  • signals received at the receiver by the various receive antennas 20 are demultiplexed, weighted, demodulated and decoded in order to recover the transmitted data.
  • a radio packet is received via the NxM channel matrix H, in the presence of additive white Gaussian noise of energy N o , E b being the bit energy.
  • the frame error probability (FER) for a particular communication link ,is derivable from the channel matrix H, interference channel matrices H 1 . . . H K and thermal noise energy N o .
  • No structured (i.e. systematic) interference is assumed present so H 1 . . . , H K are not considered.
  • the next step is to determine the channel capacity C to which the FER value is related. This was done by assuming FER to be a function of variable C as follows:
  • FEP Pr ⁇ ⁇ Frame ⁇ ⁇ Error
  • C is channel capacity of the MIMO channel H, and is determined from a MIMO channel matrix H as:
  • C log 2 ⁇ det ⁇ ( I N + 1 M ⁇ E b N o ⁇ HH H ) ( 3 ) (This is the so-called Shannon capacity formula extended to the MIMO case).
  • C is the channel capacity expressed in bits per second per Hertz (bps/Hz) for a MIMO channel H with N transmit antennas. M receive antennas, and an average signal to noise ratio of Eb/No.
  • variable C determine FER for a link of a real network is shown in FIG. 3 .
  • a series of “instantaneous” channel matrices H for the mobile user terminal of interest at different times is provided.
  • the interface variable C is evaluated in a processor 26 for the particular mobile user terminal of interest using Equation (3).
  • the value of variable C is then used to estimate FER for that link by looking up the pre-computed link level FER versus C and Eb/No calibration data stored in a memory 28 . This is done for each link of interest.
  • An embodiment of the present invention is a method of evaluating frame error probability (FER) of a communications link in a wireless telecommunications network.
  • the link is between a MIMO transmitter comprising one of a base station or mobile user terminal, and MIMO receiver comprising the other of the base station or mobile user terminal.
  • the method comprises determining values of instantaneous channel capacity of a MIMO channel of a mobile user terminal at multiple time instants over a predetermined time, processing the values to determine a level of channel capacity which any of the instantaneous channel capacity values has a predetermined probability of being less than, and looking up said level in predetermined calibration data of frame error probability (FER) versus channel capacity level so as to provide an FER value.
  • FER frame error probability
  • Example embodiments provide a way of evaluating the performance of particular links in MIMO systems in the presence of a fading channel (i.e. non-zero Doppler shift), specifically by translating high level parameters, namely channel matrix and average signal to noise ratio (Eb/No) for a mobile user terminal linked to a base station, into frame error probability (FER), which is a measure of link level performance.
  • a fading channel i.e. non-zero Doppler shift
  • high level parameters namely channel matrix and average signal to noise ratio (Eb/No) for a mobile user terminal linked to a base station
  • FER frame error probability
  • Another embodiment of the present invention relates to a wireless telecommunications network comprising a MIMO transmitter comprising one of a base station or mobile user terminal and MIMO receiver comprising the other of the base station or mobile user terminal.
  • the network includes a processor operative to determine values of instantaneous channel capacity of a MIMO channel of the mobile user terminal at multiple time instants over a predetermined time, and to process the values so as to determine a level of channel capacity which any of the instantaneous channel capacity values has a predetermined probability of being less than.
  • the network includes a look-up memory of predetermined calibration data associating frame error probability (FER) with channel capacity level and an indicator operative to give an indication proportional to the FER corresponding to the level of channel capacity determined.
  • FER frame error probability
  • FIG. 1 is a diagram illustrating a network for mobile telecommunications including multiple cells (PRIOR ART),
  • FIG. 2 is a diagram illustrating a MIMO transmitter and a MIMO receiver (PRIOR ART),
  • FIG. 3 is a diagram illustrating determination of FER (PRIOR ART),
  • FIG. 4 is a diagram illustrating determination of FER in a preferred embodiment
  • FIG. 5 is a diagram illustrating graphically a Cumulative Density Function of a channel capacity C for low Doppler shift and high Doppler shift scenarios.
  • the inventor realised that, in the known approach, being based on instantaneous system level parameters, the C variable value for a link to a particular mobile user terminal is produced without taking into account so-called multipath or other fast fading characteristics.
  • static channels such as a static Additive White Gaussian Noise (AWGN) channel, i.e. a channel without fading
  • AWGN Additive White Gaussian Noise
  • this channel capacity variable C is accurate, but this is not the case for fast fading channels.
  • fast fading is related to differences in phase between successive channel samples, to consider fading (i.e. the effect of Doppler shift) would require adapting the variable C to make the variable dependent on channel variations over a timeslot or a frame.
  • a variable was required that is a function of the differing instantaneous states of the MIMO channel matrix over a period of time, namely the time for transmission of a coding-block. This is explained further in the rest of this description below, all of which describes an approach according to the present invention.
  • a MIMO system was considered as shown in FIG. 2 with a MIMO transmitter 14 having N transmit antennas 16 and a MIMO receiver 18 having M receive antennas 20 , where a radio packet is received via the N ⁇ M channel matrix H, in the presence of additive white Gaussian noise of energy N o , E b being the bit energy.
  • the frame error probability (FER) for a particular mobile user terminal is related to the user's channel matrix H, interference channel matrices H 1 . . . H K and instantaneous thermal noise energy N o . No structured (i.e. systematic) interference is assumed present so H 1 . . . ,H K are not considered.
  • the next step was to determine the channel capacity C to which the FER value related. This was done by assuming FER to be a function of channel capacity C as follows:
  • FEP Pr ⁇ ⁇ Frame ⁇ ⁇ Error
  • H , E b N o ⁇ f ⁇ ( C ⁇ ( H , E b , N o ) ) ( 4 ) where an instantaneous value of channel capacity C is determined from a MIMO channel matrix H as:
  • C log 2 ⁇ det ⁇ ( I N + 1 M ⁇ E b N o ⁇ HH H ) ( 5 ) (This is the so-called Shannon capacity formula extended to the MIMO case).
  • C is the channel capacity expressed in bits per second per Hertz (bps/Hz) for a MIMO channel H with N transmit antennas, M receive antennas, and an average signal to noise ratio of Eb/No.
  • C s which is a stochastic (i.e. probabilistic) function of C during the time period of interest (e.g. a coding block), was determined from the simulation results.
  • C F Cumulative Density Function
  • C s is the value of C for which C is below certain level C o with probability a.
  • the cumulative density function in respect of C takes the form shown in FIG. 5 , and the C s depends on the selected a value. In use a single value of a is selected so as to produce C s values.
  • any value of a is suitable, e.g. 0.3, 0.5, or 0.7.
  • a value of a near or at 0.5 is most suitable, as shown in FIG. 5 , as it is there that the CDF and hence C s is most sensitive to C.
  • a network of cells is considered as shown in FIG. 1 with at least several mobile user terminals 2 within each cell 4 .
  • Each cell 4 is served by a base station 6
  • the instantaneous state of the network 1 is described by all the channel matrices corresponding to all the links between mobile user terminals and bast stations.
  • the method of determining link level performance (in terms of FER) from system level parameters (channel matrix H, average signal to noise ratio Eb/No) for a mobile user terminal in a real network involving MIMO links is shown schematically in FIG. 4 .
  • variable C value is evaluated in processor 30 using Equation (5) for each such “instantaneous” channel matrix H This is done repeatedly over a period of time, namely the duration of a coding block, and the values of variable C are collected, and the variable CS is estimated by the processor 30 using equation (6) for that link (i.e. that mobile user terminal) and that time period.
  • C s is then used to estimate FER by looking up the pre-computed FER corresponding to the CS and Eb/No data, i.e. frame error probability versus C s curves for various Eb/No that are stored in a memory 32 .
  • the FER value is provided at an output port 33 of the memory 32 .
  • C s is a function of fast fading (i.e. Doppler), it can adequately account for fast fading in evaluating performance of specific links.
  • the processor 30 and lookup table 32 with its output port are in the base station, although in other embodiments (not shown) these can be located elsewhere in the network, e.g. at a base station controller or other node.
  • FER is determined in this way for each of MIMO links in a wireless telecommunications network, or optionally just those links selected to be representative or of particular interest.
  • the set of FER values resulting gives an indication of overall system performance, useful for e.g. network apparatus upgrade.
  • variable C s is backwards compatible with (i.e. gives the same results as) the known approach (described above and illustrated in FIG. 3 ) in the case of the channel being static, i.e. when Doppler shift is zero. This is because then the instantaneous variable C remains constant and therefore for any value of the probability a, C s is equal to the constant value C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
US10/715,923 2003-11-18 2003-11-18 Evaluating performance of a multiple-input multiple output (MIMO) communications link Active 2025-10-09 US7424273B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US10/715,923 US7424273B2 (en) 2003-11-18 2003-11-18 Evaluating performance of a multiple-input multiple output (MIMO) communications link
EP04256702A EP1533935B1 (de) 2003-11-18 2004-10-29 Schätzen der Güte einer Mehreingangs-Mehrausgangs- (MIMO) Datenverbindung
DE602004000557T DE602004000557T2 (de) 2003-11-18 2004-10-29 Schätzen der Güte einer Mehreingangs-Mehrausgangs- (MIMO) Datenverbindung
KR1020040092296A KR101080624B1 (ko) 2003-11-18 2004-11-12 다중-입력 다중 출력(ｍｉｍｏ) 통신 링크의 성능 평가
JP2004333917A JP4564339B2 (ja) 2003-11-18 2004-11-18 多入力多出力（ｍｉｍｏ）通信リンクのパフォーマンスの評価

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/715,923 US7424273B2 (en) 2003-11-18 2003-11-18 Evaluating performance of a multiple-input multiple output (MIMO) communications link

Publications (2)

Publication Number Publication Date
US20050118958A1 US20050118958A1 (en) 2005-06-02
US7424273B2 true US7424273B2 (en) 2008-09-09

Family

ID=34435729

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/715,923 Active 2025-10-09 US7424273B2 (en) 2003-11-18 2003-11-18 Evaluating performance of a multiple-input multiple output (MIMO) communications link

Country Status (5)

Country Link
US (1) US7424273B2 (de)
EP (1) EP1533935B1 (de)
JP (1) JP4564339B2 (de)
KR (1) KR101080624B1 (de)
DE (1) DE602004000557T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060281421A1 (en) * 2005-06-14 2006-12-14 Interdigital Technology Corporation Method and apparatus for generating feedback information for transmit power control in a multiple-input multiple-output wireless communication system
US20070077952A1 (en) * 2005-10-03 2007-04-05 Sartori Philippe J Method and system for link adaptation in a wireless multi-carrier communication system
US20080039111A1 (en) * 2006-04-14 2008-02-14 Qualcomm Incorporated Methods and apparatus for use of data object popularity measurements for improved quality of service perception in wireless broadcast systems
US20090135893A1 (en) * 2003-05-01 2009-05-28 Mark Kent Method and System for Weight Determination in a Spatial Multiplexing MIMO System for WCDMA/HSDPA

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7756082B1 (en) 2001-09-07 2010-07-13 Atheros Communications, Inc. Wireless LAN using background scanning technique
US7369510B1 (en) * 2002-05-06 2008-05-06 Atheros Communications, Inc. Wireless LAN using RSSI and BER parameters for transmission rate adaptation
US7684753B2 (en) * 2004-07-21 2010-03-23 Nokia Corporation Method and device for transmission parameter selection in mobile communications
US7889692B2 (en) * 2004-09-30 2011-02-15 Alcatel-Lucent Usa, Inc. Packet error rate estimation in a communication system
EP1858191A1 (de) * 2006-05-19 2007-11-21 Mitsubishi Electric Information Technology Centre Europe B.V. Korrektur von Qualitätsmessungen eines Übertragungssystems
FR2906950B1 (fr) * 2006-10-05 2008-11-28 Canon Kk Procede et dispositifs pour adapter le debit de transmission d'un flux de donnees en presence d'interferences.
JP5127269B2 (ja) * 2007-03-07 2013-01-23 キヤノン株式会社 無線通信装置、無線通信方法、当該無線通信方法をコンピュータに実行させるためのコンピュータプログラム
KR100990041B1 (ko) 2008-09-23 2010-10-29 한국전자통신연구원 단말 대 단말 간의 채널 용량 예측 장치 및 방법
KR100981784B1 (ko) * 2009-01-05 2010-09-13 경희대학교 산학협력단 다중입력 다중출력 가우시안 도청 채널의 안정 용량을 계산하는 방법
TWI426791B (zh) * 2010-06-09 2014-02-11 Univ Ishou Interrupt capacity calculation device and method
CN114584237B (zh) * 2022-03-04 2024-01-26 东南大学 大规模天线阵列通信的空域非平稳无线信道容量计算方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2381712A (en) 2001-10-31 2003-05-07 Ubinetics Assessing quality of channels in communications systems
US20040125900A1 (en) * 2002-12-31 2004-07-01 Jung-Tao Liu Method of determining the capacity of each transmitter antenna in a multiple input/multiple out/put (MIMO) wireless system
US6801580B2 (en) * 2002-04-09 2004-10-05 Qualcomm, Incorporated Ordered successive interference cancellation receiver processing for multipath channels
US7006810B1 (en) * 2002-12-19 2006-02-28 At&T Corp. Method of selecting receive antennas for MIMO systems

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3939165B2 (ja) * 2002-02-20 2007-07-04 三洋電機株式会社 無線装置、無線通信システム、空間パス制御方法および空間パス制御プログラム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2381712A (en) 2001-10-31 2003-05-07 Ubinetics Assessing quality of channels in communications systems
US6801580B2 (en) * 2002-04-09 2004-10-05 Qualcomm, Incorporated Ordered successive interference cancellation receiver processing for multipath channels
US7006810B1 (en) * 2002-12-19 2006-02-28 At&T Corp. Method of selecting receive antennas for MIMO systems
US20040125900A1 (en) * 2002-12-31 2004-07-01 Jung-Tao Liu Method of determining the capacity of each transmitter antenna in a multiple input/multiple out/put (MIMO) wireless system
US7154960B2 (en) * 2002-12-31 2006-12-26 Lucent Technologies Inc. Method of determining the capacity of each transmitter antenna in a multiple input/multiple output (MIMO) wireless system

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
"MIMO System Simulation Methodology", 3GPP TSG RAN WG1, R1-02-0142, pp. 1-10.
"System Simulations for MIMO Enhancements to HSDPA", 3GPP TSG RAN WG2, TSGR1#1 (00)XXXX, Annex 1, pp. 1-9.
Andre P. des Rosiers, et al, "Space-Time Code Performance Bounds on Quasistatic Fading Channels," IEEE International Conference on Communications, NY, NY, vol. 1 of 5 (May 11, 2003), pp. 3160-3164.
Esa Malkamaki, et al, "Coded Diversity on Block-Fading Channels," IEEE Transactions on Information Theory, vol. 45, No. 2, (3-99), pp. 771-781.
European Search Report.
G. J. Foschini, et al, "On Limits of Wireless Communications in a Fading Environment When Using Multiple Antennas", Wireless Personal Communications 6, (1998), pp. 311-335.
Raymond Knopp, "On Coding for Block Fading Channels," IEEE Transactions on Information Theory, vol. 46, No. 1, (1-00), pp. 189-205.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090135893A1 (en) * 2003-05-01 2009-05-28 Mark Kent Method and System for Weight Determination in a Spatial Multiplexing MIMO System for WCDMA/HSDPA
US7881673B2 (en) * 2003-05-01 2011-02-01 Broadcom Corporation Method and system for weight determination in a spatial multiplexing MIMO system for WCDMA/HSDPA
US20060281421A1 (en) * 2005-06-14 2006-12-14 Interdigital Technology Corporation Method and apparatus for generating feedback information for transmit power control in a multiple-input multiple-output wireless communication system
US7630732B2 (en) 2005-06-14 2009-12-08 Interdigital Technology Corporation Method and apparatus for generating feedback information for transmit power control in a multiple-input multiple-output wireless communication system
US20070077952A1 (en) * 2005-10-03 2007-04-05 Sartori Philippe J Method and system for link adaptation in a wireless multi-carrier communication system
US7706330B2 (en) * 2005-10-03 2010-04-27 Motorola, Inc. Method and system for link adaptation in a wireless multi-carrier communication system
US20080039111A1 (en) * 2006-04-14 2008-02-14 Qualcomm Incorporated Methods and apparatus for use of data object popularity measurements for improved quality of service perception in wireless broadcast systems
US8694016B2 (en) * 2006-04-14 2014-04-08 Qualcomm Incorporated Methods and apparatus for use of data object popularity measurements for improved quality of service perception in wireless broadcast systems

Also Published As

Publication number Publication date
KR101080624B1 (ko) 2011-11-08
EP1533935A1 (de) 2005-05-25
US20050118958A1 (en) 2005-06-02
DE602004000557D1 (de) 2006-05-18
EP1533935B1 (de) 2006-03-29
JP4564339B2 (ja) 2010-10-20
JP2005151580A (ja) 2005-06-09
KR20050048475A (ko) 2005-05-24
DE602004000557T2 (de) 2006-12-14

Similar Documents

Publication Publication Date Title
CN1981472B (zh) 无线通信系统的传输模式和速率选择
CN101483496B (zh) 用于数字与多入多出通讯系统错误向量量测的装置与方法
US7424273B2 (en) Evaluating performance of a multiple-input multiple output (MIMO) communications link
Narasimhan Finite-SNR diversity–multiplexing tradeoff for correlated Rayleigh and Rician MIMO channels
US7191381B2 (en) Mode lookup tables for data transmission in wireless communication channels based on statistical parameters
EP1492294B1 (de) Auf Statistik zweiter Ordnung basierte adaptive Modulation und Kodierung
US8144797B2 (en) CQI table for wireless MIMO networks
US7477699B2 (en) Transmission technique selector for radio communication systems with multiple transmit and multiple receive antennas
US20110038272A1 (en) Generalized eesm system and method
Jin et al. Transmit beamforming in Rayleigh product MIMO channels: Capacity and performance analysis
US7778340B2 (en) Accurate channel quality indicator for link adaptation of MIMO communication systems
Mahmood et al. On the flow-level delay of a spatial multiplexing MIMO wireless channel
CN101174924A (zh) 一种测量空间信道秩的方法及系统
CN105024779A (zh) 一种自适应信道质量指示选择的方法及装置
US7986919B2 (en) Simplified impairments matrix calculation for SINR estimation
US8958467B2 (en) Reporting channel quality information for multiple channels
CN101621352B (zh) 天线模式自适应切换方法、系统及设备
CN107547119B (zh) 一种基于信道间相关性的传输模式自适应方法及装置
Liu et al. EESM based link error prediction for adaptive MIMO-OFDM system
US20090116375A1 (en) Method and apparatus for space-time coding and decoding
JP4925163B2 (ja) データフレームの誤り確率を評価する計量を確定する方法及び装置、並びにその方法を実施するためのコンピュータプログラム
Tolli et al. Compensation of interference non-reciprocity in adaptive TDD MIMO-OFDM systems
Pursley et al. Adaptive transmission for direct-sequence spread-spectrum communications over multipath channels
Moisio et al. Comparison of effective SINR mapping with traditional AVI approach for modeling packet error rate in multi–state channel
CN101577575B (zh) 实现多天线模式切换的方法、装置及系统

Legal Events

Date Code Title Description
AS Assignment

Owner name: LUCENT TECHNOLOGIES INC., NEW JERSEY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ALEXIOU, ANGELIKI;REEL/FRAME:015054/0120

Effective date: 20031117

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

AS Assignment

Owner name: CREDIT SUISSE AG, NEW YORK

Free format text: SECURITY INTEREST;ASSIGNOR:ALCATEL-LUCENT USA INC.;REEL/FRAME:030510/0627

Effective date: 20130130

AS Assignment

Owner name: ALCATEL-LUCENT USA INC., NEW JERSEY

Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:CREDIT SUISSE AG;REEL/FRAME:033949/0531

Effective date: 20140819

FPAY Fee payment

Year of fee payment: 8

AS Assignment

Owner name: PROVENANCE ASSET GROUP LLC, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NOKIA TECHNOLOGIES OY;NOKIA SOLUTIONS AND NETWORKS BV;ALCATEL LUCENT SAS;REEL/FRAME:043877/0001

Effective date: 20170912

Owner name: NOKIA USA INC., CALIFORNIA

Free format text: SECURITY INTEREST;ASSIGNORS:PROVENANCE ASSET GROUP HOLDINGS, LLC;PROVENANCE ASSET GROUP LLC;REEL/FRAME:043879/0001

Effective date: 20170913

Owner name: CORTLAND CAPITAL MARKET SERVICES, LLC, ILLINOIS

Free format text: SECURITY INTEREST;ASSIGNORS:PROVENANCE ASSET GROUP HOLDINGS, LLC;PROVENANCE ASSET GROUP, LLC;REEL/FRAME:043967/0001

Effective date: 20170913

AS Assignment

Owner name: PROVENANCE ASSET GROUP, LLC, CONNECTICUT

Free format text: PARTIAL RELEASE OF SECURITY INTEREST RECORDED AT REEL/FRAME 043967/0001;ASSIGNOR:CORTLAND CAPITAL MARKET SERVICES LLC;REEL/FRAME:046981/0600

Effective date: 20180829

AS Assignment

Owner name: FACEBOOK, INC., CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PROVENANCE ASSET GROUP LLC;REEL/FRAME:047190/0360

Effective date: 20180712

AS Assignment

Owner name: PROVENANCE ASSET GROUP HOLDINGS LLC, FLORIDA

Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:NOKIA USA INC.;REEL/FRAME:049139/0088

Effective date: 20181116

Owner name: PROVENANCE ASSET GROUP, LLC, FLORIDA

Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:NOKIA USA INC.;REEL/FRAME:047791/0566

Effective date: 20181116

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 12

AS Assignment

Owner name: META PLATFORMS, INC., CALIFORNIA

Free format text: CHANGE OF NAME;ASSIGNOR:FACEBOOK, INC.;REEL/FRAME:058871/0336

Effective date: 20211028